https://www.khanacademy.org/math/algebra-home/alg-exp-and-log/miscellaneous-radicals/v/how-to-rationalize-a-denominator 2020-06-23T07:22:43Z Intro to rationalizing the denominator When we have a fraction with a root in the denominator, like 1/√2, it's often desirable to manipulate it so the denominator doesn't have roots. To do that, we can multiply both the numerator and the denominator by the same root, that will get rid of the root in the denominator. For example, we can multiply 1/√2 by √2/√2 to get √2/2 Sal Khan video https://cdn.kastatic.org/googleusercontent/JXfSR01H3KvsGGAU_AzzpKr_Q4eXYS2kFNlfGoDPHZuldyFfyGJ5popeCmrRgayoYvTTGqvO0jIXadM5mbczaCOr Intro to rationalizing the denominator When we have a fraction with a root in the denominator, like 1/√2, it's often desirable to manipulate it so the denominator doesn't have roots. To do that, we can multiply both the numerator and the denominator by the same root, that will get rid of the root in the denominator. For example, we can multiply 1/√2 by √2/√2 to get √2/2 https://cdn.kastatic.org/ka-youtube-converted/gY5TvlHg4Vk.mp4/gY5TvlHg4Vk.mp4 618 Rationalise the denominator https://www.khanacademy.org/math/algebra-2-fl-best/x727ff003d4fc3b92:radical-functions-equations/x727ff003d4fc3b92:operations-with-irrational-numbers/e/rationalising-the-denominator-basic 2026-02-26T15:40:49.311158104Z Rationalising the denominator (basic) Rationalising the denominator (basic) anmol exercise https://www.khanacademy.org/math/algebra-2-fl-best/x727ff003d4fc3b92:radical-functions-equations/x727ff003d4fc3b92:operations-with-irrational-numbers/e/rationalising-the-denominator 2026-02-26T15:40:49.311158104Z Rationalising the denominator (advanced) Rationalising the denominator (advanced) anmol exercise https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:real-numbers/x06d55bfa213a79fd:operations-on-real-numbers/e/number-systems-1-5 2025-03-28T07:05:36.573142233Z Number systems 1.4 Number systems 1.4 ashish exercise https://www.khanacademy.org/math/algebra-2-fl-best/x727ff003d4fc3b92:radical-functions-equations/x727ff003d4fc3b92:operations-with-irrational-numbers/e/multiplying-irrational-numbers 2025-02-18T09:32:54.463014983Z Multiplying and dividing irrational numbers Multiplying irrational numbers anmol exercise https://www.khanacademy.org/math/algebra-2-fl-best/x727ff003d4fc3b92:radical-functions-equations/x727ff003d4fc3b92:operations-with-irrational-numbers/e/multiplying-and-dividing-irrational-numbers 2026-02-26T15:40:49.311158104Z Multiplying irrational expressions Multiplying irrational expressions anmol exercise